Micrometer-protractor.



UNITED sraigslrnm OFFICE.

LEON FUCHS, OF DAYTON,

OHIO, ASSIGNOR T BROWN n SHARPE MANUFACTRING COMPANY, OF PROVIDENCE,RHODE ISLAND, A CORPORATION OF RHODE ISLAND.

MICROMETER-PROTRACTOR.

Specification of Letters Patent.

Patented May 9, 1911.

Application filed August 3, 1908. Serial No. 446,574.

To all whom it may concern.'

Be itknown that I, LEON Foei-Is, a citizen of Switzerland, residing atDayton,4 in the county of M mtgomery and State of Ohio, have invented anew and useful Improvement in MicrometerProtractors, of which thefollowing is a specification.

This invention has reference to an improvement in instruments formeasuring angies and more particularly to an improvement in micrometerprotrae-tors, bevel gages or similar instruments.

Mierometer prot actors or similar instruments as heretofore constructed,usually hare a multiplicity of parts for n'lierometrie adjustment, whichwear outy easily and the instruments to contain those parts are heavyand cumbersome to handle, particularly for drafting or light machinistswork.

The object of my invention is to improve the construction ol' amieron'ieter protraetor or similar instrument, whereby the micrometrie.adjustment is simplified and the thickness and weight of the instrumentreduced to a minimum.

further object of my invention is to provide a mierometer protractor orsimilar instrrunent with a detachal'ile key7 adapt'- edto operate themierometrie adjustment ot' the instrument'.

.t still further object oi my invention is to reduce the cost ofnlanulaetiuriner micrometer protractors or similar instruments.

lMy invention consists in the peculiar :old novel constrluftiml otE a`micrometer protractor or similar inst'run'ient, said instrulent havingldetails of collstruetiol'l, as will l .nore i'ully set torth hereimitterand claimed.

Figure l is4 a top plan view ot: a protraetor provided with my improvedmicromelrie adjustment. Iiig, 2 is an edge view of the protractor. Fig'.2t is an enlarged vertical sectional View through (he protraetor takenon line l 5l of Fig. 1. ltig. l is an enlarged detail View showing' thekey-hole in the. initier-siete oli4 the protractor. Fia'. 5 is anenlarged detail sectional view taken on line 5 V ot` Fig. Il with thekey in its operative position in the inst rumeni', and Fira-t3 is anenlarged detail sectional View ot' a modilied form of mieroim-triezuljustment.

lh the dra \\'i|`|; js, rf, indicates the lal. body, 7; the' indicatingdisk, r: the movable blade, c! the \\asher, e the thumb nut', f themicrometric gear, and g the micromet-ric key of my improved micrometerprotractor.

The flat body (L has a fixed bifureated blade 7, a circular head 8 witha central serew-tlneaded stud t), a concentric scale 10 and anoft-center key-hole 11 which extends through the head S in apredetermined position relative to the stud 9, as shown in Fig. 3.

The indicating disk has a beveled edge 12, an indicating,r line on theedge, a concentric circular depression 13 in its underside, a centralhole 1l. and an arm 15 having a boss 1G in which is a hole 17 andsecured radially to the disk in a position for the boss 1G to enter thehole 14 in the disk and `for the stud t) to extend through the hole 17in the boss 16, thereby rotatably seeuring'the disk L to the stud t).The movable blade. o is detachably secured to the outer end of the arm1:1 in any well known way. The washerd is placed on the stud i) over thearm and the thumb nut e (which forms a convenient means for handlingrthe instrument) is screwed down on the stud t) onto the 'asher (I,thereby clamping the disk i) to the head S after adjustment. Themicrometric gear has the central hole lSvtorthe boss lf3 aml is securedeoneentrict'llly to the disk in the. depression 13 by a pin 4or othermeans. 'lhe size of the gear f is such that the teeth on th(` gear willextend the depth of the teeth over the inner edge of the keyhole 11, asshown in Figs. Itandft. The key f/ has a knurled head l) .ircular flange2U. and a stem 2l, the, id ofwhieh is formed into a pinion 22 aptedftobe inserted through the key-hole` ll in the underside ofthe head 8 amlmesh with the mierometric `gear f. as shown in Fig. 5.

ln the modified form, as shown in Fig'. (i, the pinion 22 has preferablya square hole 255 and is rotatably and permanently secured in the holell in a position to mesh wit-h the n 'ear j, and the key r/ has a squareendI 2t adapted to enter the square hole 2&5 in the4 pinion 29..

rlhe movable blade r: is moved by hand for ordinary purposes to theangle required, indieated by the line ou the. disk l; and the seale l()on the head 8 and secured in the adjusted position by tightening thethumb nut; .,f. then `reater accuracy is required the blade r.' is movedapproximately the ande wanted, thekey g inserted into the keyhole Il,thereby bringgfing,r the Vpinion 22 into mesh with the gear'f, and thekey g is turned until the line on thedisk b indicatesV the rcquireddegree or minute on the scale, when the thumb nut e is tightened and thekey g removed from the instrument.

' By the use of my improved construction in micrometer protractors orsimilar' instruments, all ofthe part-s heretofore used for connecting ordis-connecting the micrometric mechanism are discarded, therebysimplitying the construction and reducing the thickness of theinstrument.

I-Iaving thus described my invention, I claim as new and desire tosecure by Letters Iatent;-

1. In a micrometer protractor, a stationary member'having an opening, arevoluble member superimposed on said stationary member, and means toactuate the re'voluble member including a key for operating said means,said key being removably insertible in said opening.

' 2. In a. micrometer protractor or similar instrument, a stationarymember provided with a hole, a movable ,1 i'1ember, a micrometricactuating member intermediate the stationary and movable members and adetachable member adapted t-o engage With the micrometric acta-tingmember through the hole in the stationary member.

'3. In a micrometer protractor or similar instrument, a stationarymember provided with a hole, a movable member rotatably secured to thestationary member, a micrometric actuating member secured to the movablemember intermediate the stationary and movable members, and a detachablemember adapted to'engage with the micrometric actuating member through'the hole in the stationary member. Y

4. In a micrometer protractor vor similar instrument, a stationarymember provided with a hole and having a fixed arm, a movable memberrotatably'y secured, to the sta tionary member, an arm adjust-ablysecured to the movablemember, a mlcrometric actuating member securedtothe movable member intermediate the stationaryand movable members, and adetachable member adapted to engage with the micrometric actuatingmember through the hole in the stationary member.

5. In a micrometer protractor or similar instrument, a 'lat stationarymember having a. key-hole, a fixed arm', and a scale, an indieatingmember rotatably secured to the stationary member concentric vWith thescale, an arm adjustably' secured to the rotatable indicating member, agear secured to the rotatable indicating member intermediate thestationary and indicating members, and a detachable key having a pinionadapted to be inserted through the key-hole in the stationary member ina position for the 'pinion on the` key to mesh with the gear on theindieating member.

G. In a micrometer protractor or vsimilar instrument, a Hat stationarymember having a fixed arm anda scale, an indicating member rotatablysecured to the stationary member concentric With the scale, an armadjustably secured to the rotatable indicating member, a gear secured tothe rotatable indicating` 'member, and detachable means adapted tooperate the gear, as described.

7. In a micrometer protractor or similar instrument, the combination ofthe following instrumentalities: a fiat body member` b having thefixed'blade 7, the screw-threaded 'ablysecured to the indicating dislrb,a

Washer d on the stud 9 over the disk b, a thumb nut e on the stud 9 overthe Washer d, a micrometric gear f secured to thedislc b and a key ghaving a pinion 22 adapted to beinserted through t-he key-hole 11inapesit-ion to mesh with the gear f, vas described.

'In testimony whereof Ihave signed my name to this specification in thepresence of two subscribing Witnesses. I

LEON FUCHS, Witnesses: 'l

' ADA E. HAGERTY,

LUTHER D. BURLINGAMn

